Before an arborist visit, record the date, repeatable viewpoints, visible changes, recent weather, and your questions. Pair a whole-tree photograph with closer views taken from a safe place, and keep the earlier images even when a later set appears clearer.

The purpose is to give the arborist a useful history, not to decide from photographs whether a tree is safe or what is causing a symptom. If you notice a sudden structural change or a broken branch hanging over an area people use, seek prompt professional assessment instead of waiting for the next seasonal photo.

Which photographs make a useful starting set?

Start with one tree and give it a simple identifier, such as “front-yard oak,” if you know the species. If you are unsure, write “species unknown.” Note the tree’s location and nearby features that will help the arborist find it. Avoid guessing its age or a diagnosis.

From a safe ground-level position, make a wide image that includes the whole tree and its surroundings. If the crown will not fit in one frame, take overlapping views and note their order. Include relevant surroundings, such as a path, driveway, building, or play area, so the arborist can understand where people and property are in relation to the tree.

Take another view of the visible lower trunk and ground around it, and additional images of anything that prompted your concern. A wider context image followed by a closer image helps show where a feature sits on the tree. Use the camera’s zoom if needed; do not approach an area that may be unsafe just to get a sharper picture.

Choose a repeatable viewpoint, such as a spot beside a garden gate, and write down where you stood and which direction you faced. Keep the same camera orientation and framing when practical. A fixed feature in the background can help you line up a later image, although camera angle and perspective can still make an apparent lean difficult to compare.

For broader preparation before a visit, TreeWorkGuide planning guides can help frame questions about the work and access around the property. The photo log adds a dated record of the particular tree and the changes you want the arborist to see.

What belongs in the worksheet for each photo set?

Make one entry per visit to the tree, even if you take several pictures. Keep observations separate from interpretations: “brown leaves on the outer tips of the left side” is more useful than an unsupported disease name. If you did not notice something previously, say so; that is different from knowing it was absent.

Use the following worksheet for both the first set and each follow-up. An approximate date or “unknown” is better than a precise detail you cannot support. Record only what you can observe from a safe position.

Field | What to record | Example entry

Date and season | Date photographed and general leaf stage | May 12; leaves expanded

Tree and viewpoint | Tree identifier, standing position, direction, and image names | Front-yard oak; beside gate, facing house; images A1–A3

Visible observations | Location, appearance, and extent of a feature without assigning a cause | Sparse-looking foliage on the driveway side

Changes | What differs from an earlier set and when you first noticed it | Several bare branch tips visible now; first noticed this week

Weather and site context | Known recent weather, watering, construction, or ground changes; distinguish facts from uncertainty | Heavy rain last weekend; driveway work in April

Questions | What you want the arborist to assess or explain | Is the sparse area a concern, and what should we monitor?

How should two seasonal sets be compared?

Place matching wide views side by side, then compare the corresponding detail views. Check the dates, viewpoint, lighting, and leaf stage before calling a difference a change. A leafless winter crown and a fully leafed summer crown show different things; neither image alone establishes a decline. A closer match in season and framing can make a foliage comparison easier.

Consider a hypothetical homeowner who photographed an oak from the garden gate in May and again in September. In May the crown looked full from that angle. In September the homeowner sees a thinner-looking patch on the driveway side and notes that several branch tips appear bare. The log also records a hot, dry spell and that the second picture was taken later in the day.

The homeowner can mark the area on a copy of each image and write, “First noticed in September; not sure when it began.” The two images give the arborist a starting point, but they do not establish whether the difference reflects stress, seasonal change, lighting, viewing angle, or something else. The arborist may need to inspect the tree and its site before offering an explanation.

Compare trunk and ground views with the same care. A shadow can resemble a mark, and a different camera angle can make a trunk appear to lean differently. If a suspected change could be serious, describe it when arranging the appointment rather than waiting for another photograph to confirm it.

Which details help an arborist investigate?

For foliage, note where discoloration, smaller-looking leaves, early leaf drop, or bare branch tips appear and whether they affect one part of the crown or appear more widespread. The International Society of Arboriculture identifies changes in leaf formation, leaf size, twig growth, and crown dieback as useful observations during tree inspection. These are observations to report, not a checklist that establishes a diagnosis.

For the trunk and visible ground, record apparent cracks, wounds, cavities, fungal growth, or disturbed soil by location and appearance. Note whether you have an older photograph of the same area. Do not probe a cavity, disturb roots, or clear material away to make the picture more revealing; tell the arborist what you could and could not see.

Context can also explain what the arborist should ask about. Record known excavation, paving, soil added or removed, changes to drainage, and vehicle access near the tree, with approximate dates. ISA notes that construction can affect trees through injury, soil compaction, root loss, and changes in drainage. Mention recent care or watering if you know it, but avoid assuming that any one event caused the observed change.

Record weather as context rather than a conclusion: “strong winds overnight” or “several weeks with little rain, according to my notes” is more useful than “wind damaged the roots.” If the tree is on shared or public land, note that location when contacting the appropriate property manager or local authority.

When should you seek help before completing the log?

Contact a qualified arborist promptly about a newly noticed split, a sudden change in lean, disturbed or lifting soil near a leaning tree, or a broken or hanging branch that could reach people or property. ISA identifies cracks, soil movement, and dead branches among signs that warrant professional attention. University of Minnesota Extension advises immediate contact with a tree-care professional or local forestry department when broken hanging branches or unsupported branches over a sidewalk present a potential hazard.

Keep people away from the affected area and take photographs only if you can do so from a safe location. Do not stand beneath a hanging branch or go closer to investigate. If a wire is down or involved, stay away and contact the utility immediately; do not touch the wire or the tree. In an immediate emergency, contact local emergency services.

Discolored leaves, early leaf drop, or dead branches are also reasons to contact an arborist for advice, particularly when a change is new or spreading. Ask the professional how soon the tree should be seen and describe what is nearby. A calm-looking photograph cannot establish that a tree or surrounding area is safe.

What should you send before the appointment?

Send a short selection rather than every image: the matching wide views, a context-and-detail pair for each concern, and the completed worksheet. Label files with the tree identifier and date, and explain which images show the same viewpoint. Keep the originals available in case the arborist wants more detail or an earlier image.

Ask what the arborist can determine during the visit, whether the observed feature needs further assessment, what changes should trigger another call, and when to follow up. If work is recommended, ask for the proposed scope and how access and nearby property will be handled.

A photo record can reveal a useful timeline, but it cannot show every branch, root, or internal condition. An arborist’s assessment may involve an on-site visual inspection and, where appropriate, instruments. Leave the tree undisturbed and use the log to make that conversation more specific.

A Tree-Care Photo Log an Arborist Can Compare Across Seasons